Understanding spin control mechanisms is crucial in condensed matter physics and serves as a theoretical foundation for designing spintronic devices. In this paper, we propose that the primary magnetic mechanism in NdFe 1−x Cr x O 3 is driven by temperature-sensitive spin reorientation, based on a four-sublattice molecular field theory. The actual coupling angular momentum, as well as the angle between the Nd 3+ and Fe 3+ /Cr 3+ moments at a given temperature, is achieved through the projection of the Nd 3+ magnetic moment onto the Fe 3+ /Cr 3+ plane. As the temperature increases, the angle between the Nd 3+ moment and the Fe 3+ /Cr 3+ moment decreases monotonically. In this study, we present the magnetic mechanism of NdFe 1−x Cr x O 3 (x = 0.1 and 0.9) and the close relationship between the A/B angle and temperature, which establishes a theoretical basis for designing new multifunctional magnetic materials.
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